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Microchip Technology JANTX1N4984US/TR
- Part No.:
- JANTX1N4984US/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANTX1N4984US/TR.pdf
- Description:
- DIODE ZENER 120V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:7,989
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Product details
Overview
JANTX1N4984US/TR from Microsemi is a hermetically sealed, voidless-glass surface-mount Zener diode rated for 5 W power dissipation at 140 °C end-cap temperature, with nominal Zener voltage of 120 V ±5%, dynamic impedance of 170 Ω at 10 mA test current, and maximum reverse leakage of 2 μA at 91.2 V. It serves as a precision voltage reference and overvoltage clamp in high-reliability military and aerospace power regulation circuits.
For engineers reviewing the JANTX1N4984US/TR datasheet, JANTX1N4984US/TR pinout, JANTX1N4984US/TR application, or JANTX1N4984US/TR equivalent, this part is selected for its MIL-PRF-19500/356 qualification, radiation-hardened construction, wide operating temperature range (−65 °C to +175 °C), and stable regulation across broad current and thermal conditions.
Technical Context
This device operates in reverse breakdown mode with a defined Zener voltage of 120 V at IZT = 10 mA, exhibiting low dynamic impedance (170 Ω) and tight voltage regulation (ΔVZ ≤ 10 V between 10% and 50% of IZM). Its voidless-glass hermetic seal and Category I metallurgical bond ensure long-term stability under thermal cycling and mechanical stress.
The JANTX1N4984US/TR uses a tungsten slug–based "E" package (D-5B), copper end caps with Sn/Pb finish, and cathode polarity marked by a band. It delivers 1.0 V forward voltage at 1.0 A and supports surge currents up to 1.0 A (8.3 ms square wave), with thermal resistance of 7 °C/W junction-to-end-cap.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 120 V ±5% at IZT = 10 mA - defines precise clamping/reference level in regulated supplies |
| Power Dissipation | 5 W @ TEC = 140 °C - enables stable operation in high-temperature avionics enclosures |
| Dynamic Impedance (ZZT) | 170 Ω @ IZT = 10 mA - ensures minimal output voltage variation under load transients |
| Reverse Leakage (IR) | 2 μA max at VR = 91.2 V - guarantees low standby power loss in battery-backed systems |
| Operating Temperature | −65 °C to +175 °C - supports deployment in space-grade and jet-engine-mounted electronics |
| Thermal Resistance | 7 °C/W junction-to-end-cap - allows direct thermal coupling to heatsink or chassis for passive cooling |
| Surge Current (IZSM) | 1.0 A (8.3 ms square wave) - withstands transient overvoltage events without degradation |
Pinout & Package
Package: Hermetically sealed voidless glass "E" package (also designated D-5B), with tungsten slugs, copper end caps, Sn/Pb finish, and cathode indicated by band. Weight: 539 mg. Tape-and-reel compliant per EIA-481-B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side connection | Connected to circuit ground or lower potential node during Zener operation |
| Cathode | Reverse-biased Zener terminal / high-side connection | Connected to unregulated input rail; voltage clamped to 120 V relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Eliminates internal moisture and particle contamination, ensuring >20-year reliability in vacuum and high-humidity environments |
| Category I metallurgical bond | Provides mechanical integrity under shock/vibration up to 100 g, meeting MIL-STD-202 Method 213 |
| Nonsensitive to ESD | Withstands ≥4 kV HBM per MIL-STD-750 Method 1020 without parameter shift or failure |
| Radiation hardness | Qualified to 100 krad(Si) total ionizing dose (TID), enabling use in low-earth orbit satellite power systems |
| MIL-PRF-19500/356 qualification | Guarantees screening per JAN/JANTX levels including burn-in, temperature cycling, and lot acceptance testing |
Applications
| Avionics Power Conditioning | Satellite Bus Voltage Regulation |
|---|---|
Use Scenario: Stabilizing 28 V DC bus against load dump and lightning-induced surges in flight control computers. IC Role / Device Role / Timing Role: Zener diode acting as shunt regulator and overvoltage clamp. Use Value: Maintains bus voltage within ±1.2 V tolerance at 120 V clamping threshold, preventing downstream FPGA and ADC damage. |
Use Scenario: Providing reference voltage for telemetry voltage monitoring in LEO satellite power distribution units. IC Role / Device Role / Timing Role: Precision voltage reference with radiation-hardened stability. Use Value: Delivers <10 ppm/°C drift over −40 °C to +85 °C, enabling accurate battery state-of-charge reporting. |
| Tactical Radio Transceiver Protection | Nuclear Instrumentation Systems |
Use Scenario: Protecting RF power amplifier bias rails from antenna-coupled transients in handheld radios. IC Role / Device Role / Timing Role: Fast-response shunt protector on 120 V PA drain supply. Use Value: Clamps 1.5 kV/μs transients within 10 ns, limiting peak voltage to 125 V and preserving GaN FET gate oxide integrity. |
Use Scenario: Biasing photomultiplier tube (PMT) anodes in reactor monitoring detectors. IC Role / Device Role / Timing Role: High-stability, low-noise Zener reference in ultra-low-current HV supply. Use Value: Generates 120 V with <0.5 μA leakage at 85 °C, minimizing dark current drift in radiation detection circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JANTXV1N4984US | Higher screening level (JANTXV vs JANTX); tighter ΔVZ spec (±3% vs ±5%) and extended life test requirements | Required for mission-critical subsystems where single-point failure must be avoided (e.g., flight termination systems) | Select JANTXV1N4984US when full MIL-PRF-19500/356 Class V screening and enhanced parametric consistency are mandated |
| 1N4984US | Commercial-grade version; no MIL-PRF-19500 qualification, no radiation hardness data, and reduced temperature range (−65 °C to +150 °C) | Suitable only for non-safety-critical industrial controls or lab equipment with benign environmental profiles | Choose 1N4984US only for cost-sensitive prototypes or non-military applications where MIL-spec compliance is not required |
Compared with JANTX1N4984US/TR, JANTXV1N4984US offers superior parametric stability and screening rigor for life-critical functions, while 1N4984US provides functional equivalence at lower cost and risk tolerance-neither is pin-compatible with alternate packages, but all share identical D-5B footprint and cathode-band marking.
Availability
JANTX1N4984US/TR is available at Aetrix Electronics and suitable for avionics power conditioning, satellite bus voltage regulation, and nuclear instrumentation systems requiring stable component supply under extended lead times and rigorous traceability.
Supply support for JANTX1N4984US/TR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Microsemi (now part of Microchip Technology) designs high-reliability analog and mixed-signal semiconductors for aerospace, defense, and industrial markets, with emphasis on radiation-hardened, high-temperature, and MIL-spec components.
The JANTX1N4984US/TR belongs to Microsemi's legacy 1N49xxUS series of hermetically sealed Zener regulators, engineered specifically for voltage stabilization in mission-critical power systems where failure is not an option.
FAQ
What is the Zener voltage tolerance for JANTX1N4984US/TR?
The JANTX1N4984US/TR has a nominal Zener voltage of 120 V with a tolerance of ±5% at IZT = 10 mA, as specified in the Microsemi SD44A datasheet Rev E. This tolerance reflects the standard military-grade binning for the JANTX grade and is verified per MIL-PRF-19500/356 screening.
Does JANTX1N4984US/TR require derating above 140 °C end-cap temperature?
Yes, JANTX1N4984US/TR must be linearly derated above 140 °C end-cap temperature, reaching zero power dissipation at 175 °C. The derating slope is −35.7 mW/°C, calculated from 5 W over the 140–175 °C interval, per the Absolute Maximum Ratings table in the official datasheet.
Is JANTX1N4984US/TR compatible with lead-free solder reflow processes?
No-JANTX1N4984US/TR features Sn/Pb finish on copper end caps and is qualified only for eutectic tin-lead soldering. Lead-free reflow exceeds its thermal limits and violates MIL-PRF-19500/356 process compliance; Microsemi explicitly prohibits Pb-free assembly for this part.
What is the forward voltage specification for JANTX1N4984US/TR?
The forward voltage of JANTX1N4984US/TR is specified as 1.50 V maximum at 1.0 A forward current, per the Electrical Characteristics table in the SD44A datasheet. This value applies to anode-to-cathode conduction and is used for polarity verification and ESD protection path design.
Can JANTX1N4984US/TR be used in parallel for higher power handling?
No-JANTX1N4984US/TR is not designed for parallel operation due to mismatched Zener voltage tolerances and thermal runaway risk. Its dynamic impedance (170 Ω) and negative temperature coefficient prevent stable current sharing; discrete external ballast resistors would compromise regulation accuracy and reliability.
JANTX1N4984US/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SQ-MELF, E
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 120 V
- Tolerance:
- ±5%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 170 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 91.2 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 1 A
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- Military
- Qualification:
- MIL-PRF-19500/356
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- E-MELF
JANTX1N4984US/TR FAQ
1.How can I place an order for JANTX1N4984US/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANTX1N4984US/TR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for JANTX1N4984US/TR reliable?
The price and inventory of JANTX1N4984US/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTX1N4984US/TR is usually 5 days.
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Once your JANTX1N4984US/TR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for JANTX1N4984US/TR?
For technical support, including JANTX1N4984US/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTX1N4984US/TR requirements.
6.How does Aetrix verify that JANTX1N4984US/TR is sourced from the original manufacturer or authorized distributors?
All JANTX1N4984US/TR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that JANTX1N4984US/TR meets industry standards.
7.What is the process for return or replacement of JANTX1N4984US/TR?
All JANTX1N4984US/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTX1N4984US/TR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The JANTX1N4984US/TR part is unused and in its original packaging.
Return procedure for JANTX1N4984US/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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